Sequels have a hard time increasing after the first one has such a huge performance. Matrix, TDK, Shrek, Pirates all had big increases from their predecessors because the first films had leggy BO runs and built up a lot of hype and goodwill for the franchise. X-Men and LOTR enjoyed small steady increases from film to film as the franchise maximized its potential with the final film.But for the most part sequels will have trouble matching the first film after the first film reaches uber blockbuster status. Spider-Man, Harry Potter, both Star Wars trilogies, Narnia, Jurrasic Park, etc. All of these films were cultural phenomenons and their sequels couldn't keep up despite their quality.